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basic language utils
There is a newer version: 1.0.9
package net.dongliu.commons.lang;

import java.io.OutputStream;
import java.io.PrintStream;
import java.util.Collection;

/**
 * utils method do to output and input.
 * 
 * println:
 *     IO.println("test").println("another test");
 *     IO.sep(" -- ").end("$$\n").println(1, 2, "adsfa").println("test");
 * 
 *
 * @author Dong Liu
 */
public class IO {

    /**
     * print parameters
     */
    public static Printer println(Object... params) {
        Printer printer = Printer.defaultPrinter;
        printer.println(params);
        return printer;
    }


    public static  Printer println(Collection params) {
        Printer printer = Printer.defaultPrinter;
        printer.println(params);
        return printer;
    }

    /**
     * set separator. default " "
     */
    public static Printer.Builder sep(String delimiter) {
        return Printer.newBuilder().sep(delimiter);
    }

    /**
     * set output. default System.out
     */
    public static Printer.Builder out(OutputStream out) {
        return Printer.newBuilder().out(out);
    }

    /**
     * set output. default System.out
     */
    public static Printer.Builder out(PrintStream out) {
        return Printer.newBuilder().out(out);
    }

    /**
     * set line end. default "\n"
     */
    public static Printer.Builder end(String lineEnd) {
        return Printer.newBuilder().end(lineEnd);
    }

    public static class Printer {
        private final String separator;
        private final String end;
        private final PrintStream out;

        public Printer(String separator, String end, PrintStream out) {
            this.separator = separator;
            this.end = end;
            this.out = out;
        }

        private static Printer defaultPrinter = newBuilder().build();

        public Printer println(Object... params) {
            for (int i = 0; i < params.length; i++) {
                out.print(params[i]);
                if (i != params.length - 1) {
                    out.print(separator);
                } else {
                    out.print(end);
                }
            }
            return this;
        }

        public  Printer println(Collection params) {
            int i = 0;
            for (T param : params) {
                out.print(param);
                if (i++ != params.size() - 1) {
                    out.print(separator);
                } else {
                    out.print(end);
                }
            }
            return this;
        }

        private static Builder newBuilder() {
            return new Builder();
        }

        public static class Builder {
            private String separator = " ";
            private String end = "\n";
            private PrintStream out = System.out;

            public Builder sep(String delimiter) {
                this.separator = delimiter;
                return this;
            }

            public Builder end(String end) {
                this.end = end;
                return this;
            }

            public Builder out(PrintStream out) {
                this.out = out;
                return this;
            }

            public Builder out(OutputStream out) {
                this.out = new PrintStream(out);
                return this;
            }

            public Printer build() {
                return new Printer(separator, end, out);
            }

            public Printer println(Object... params) {
                Printer printer = this.build();
                printer.println(params);
                return printer;
            }

            public  Printer println(Collection params) {
                Printer printer = this.build();
                printer.println(params);
                return printer;
            }
        }

    }

}